题目内容
Space is filled with radiant energy and beyond earth’s atmosphere this energy flow steadily and intensely from the sun. An abundant and essential (67) of energy would be used in space by developing satellite solar (68) stations. To live in space, humans must be protected (69) the fierce intensity and penetrating sunlight. The colony will have to have enough energy to (70) a fairly uniform temperature. The sun is not dimmed (71) an atmosphere. Shaded materials not (72) to direct sunlight will almost be absolute zero, while the temperature can soar above the (73) point. The colony will need to have both heaters and (74) Fortunately, sun’s energy can be converted (75) electricity. Converting sun’s energy, we would (76) stations in the space that would intercept (77) sunlight. The stations intercept enough sunlight to (78) five nuclear reactors and they could be as (79) as nine miles long and four miles wide while they weigh twenty thousand tons. This is a (80) free way to generate electricity and cost no (81) than coal or nuclear energy. Solar cells do the actual converting. A useful material found in lunar soil is silicon which is used to make solar cells. (82) we can produce a large amount of these cells and then we avoid any problems of (83) the material from earth. A solar cell is made from two thin layers of silicon. Sunlight (84) on the cell shakes the electrons (85) , and then these electrons move off into an outside circuit, which is detected as an electrical current. Things are arranged (86) most of the work involved in generating the electricity is done by forces associated with the atoms themselves.
查看答案
搜索结果不匹配？点我反馈
更多问题
Reality television is a kind of television programming which, it is claimed, presents unscripted dramatic or humorous situations, documents actual events, and features ordinary people rather than professional actors. It could be described as a form of artificial or heightened documentary. Although it has existed in some form or another since the early years of television, the current explosion of popularity dates from around 2000. Reality television covers a wide range of television programming formats, from game or quiz shows which resemble the crazy, often demeaning (贬低人的) programs produced in Japan in the 1980s and 1990s, to monitor focused productions such as Big Brother. Critics say that the term "reality television" is somewhat of a misnomer (误称) and that such shows frequently portray a modified and highly influenced form of reality, with participants put in special locations or abnormal situations, sometimes coached to act in certain ways by off-screen handlers, and with events on screen manipulated through editing and other post-production techniques. Part of reality television’s appeal is due to its ability to place ordinary people in extraordinary situations. For example, on the ABC show, The Bachelor, a male dates a dozen women at the same time, traveling on extraordinary dates to scenic places. Reality television also has the potential to turn its participants into national celebrities, outwardly in talent and performance programs such as Pop Idol, though frequently Survivor and Big Brother participants also reach some degree of celebrity. Some critics have said that the name "reality television" is an inaccurate description for several styles of program included in the kind. In competition-based programs such as Big Brother and Survivor, and other special-living-environment shows like The Real World, the producers design the format of the show and control the day-to-day activities and the environment, creating a completely fabricated(杜撰的) world in which the competition plays out. Producers specifically select the participants, and use carefully designed plots, challenges, events, and settings to encourage particular behaviors and conflicts. Mark Burnett, creator of Survivor and other reality shows, has agreed with this assessment, and avoids the word "reality" to describe his shows; he has said, "I tell good stories. It really is not reality TV. It really is unscripted drama.\ Producers choose the participants ______.
Space is filled with radiant energy and beyond earth’s atmosphere this energy flow steadily and intensely from the sun. An abundant and essential (67) of energy would be used in space by developing satellite solar (68) stations. To live in space, humans must be protected (69) the fierce intensity and penetrating sunlight. The colony will have to have enough energy to (70) a fairly uniform temperature. The sun is not dimmed (71) an atmosphere. Shaded materials not (72) to direct sunlight will almost be absolute zero, while the temperature can soar above the (73) point. The colony will need to have both heaters and (74) Fortunately, sun’s energy can be converted (75) electricity. Converting sun’s energy, we would (76) stations in the space that would intercept (77) sunlight. The stations intercept enough sunlight to (78) five nuclear reactors and they could be as (79) as nine miles long and four miles wide while they weigh twenty thousand tons. This is a (80) free way to generate electricity and cost no (81) than coal or nuclear energy. Solar cells do the actual converting. A useful material found in lunar soil is silicon which is used to make solar cells. (82) we can produce a large amount of these cells and then we avoid any problems of (83) the material from earth. A solar cell is made from two thin layers of silicon. Sunlight (84) on the cell shakes the electrons (85) , and then these electrons move off into an outside circuit, which is detected as an electrical current. Things are arranged (86) most of the work involved in generating the electricity is done by forces associated with the atoms themselves.
Space is filled with radiant energy and beyond earth’s atmosphere this energy flow steadily and intensely from the sun. An abundant and essential (67) of energy would be used in space by developing satellite solar (68) stations. To live in space, humans must be protected (69) the fierce intensity and penetrating sunlight. The colony will have to have enough energy to (70) a fairly uniform temperature. The sun is not dimmed (71) an atmosphere. Shaded materials not (72) to direct sunlight will almost be absolute zero, while the temperature can soar above the (73) point. The colony will need to have both heaters and (74) Fortunately, sun’s energy can be converted (75) electricity. Converting sun’s energy, we would (76) stations in the space that would intercept (77) sunlight. The stations intercept enough sunlight to (78) five nuclear reactors and they could be as (79) as nine miles long and four miles wide while they weigh twenty thousand tons. This is a (80) free way to generate electricity and cost no (81) than coal or nuclear energy. Solar cells do the actual converting. A useful material found in lunar soil is silicon which is used to make solar cells. (82) we can produce a large amount of these cells and then we avoid any problems of (83) the material from earth. A solar cell is made from two thin layers of silicon. Sunlight (84) on the cell shakes the electrons (85) , and then these electrons move off into an outside circuit, which is detected as an electrical current. Things are arranged (86) most of the work involved in generating the electricity is done by forces associated with the atoms themselves.
The oceans, which cover nearly three-quarters of Earth’s surface, remain largely unexplored because of their vastness and inaccessibility to us air breathers. Webb Research of East Falmouth, Massachusetts, hopes to open up much of that mystery field with a new underwater vehicle that is pushed ahead solely by the ocean itself, so it can potentially study the watery depths for years at a time. Such long-lasting detectors may someday form fleets that provide up-to-minute data for weather forecasting. In the past, such autonomous underwater vehicles, or AUVs, have been battery powered and therefore required frequent recharges that limited their distance and depth of travel. Webb’s Slocum glider(滑翔机) hopes to solve this problem. "We conceived of a thermally powered engine to get the energy from the colder deep water of the ocean and the shallower warm water," Clayton Jones, an engineer at Webb Research, explains. "We picked out a material that undergoes a state change between those two temperatures in the ocean." When cold, this form-shifting substance is a compact solid. When warm, it expands and becomes a less dense liquid. The material’s expansion in warmer waters charges an internal mechanism that acts like stored power to control its buoyancy: by pumping mineral oil in and out of an external air bag, it alters its volume but maintains its weight. "The glider takes up more volume and becomes lighter than the water around it--less dense," Jones says. Scientists can also fit the Slocum glider with a variety of different sensory equipment and Global Positioning Systems. Each time it surfaces, it can raise its tail antenna(天线) to transmit data to and receive instructions from researchers sitting comfortably in their cozy offices. The glider will have its first test in salt water at the end of this September. The gliders could also get through and follow previously unstudied phenomena such as small underwater eddies (漩涡), which are vital to understanding water transport and heat flow in the ocean and therefore play an important role in storm formation and other weather development. "We have all these data snapshots(快照) from floats that just flow with the deep ocean current," Jones says. "To be able to fly through eddy sections, then transport with the whole eddy itself as it moves through the ocean, would be a very nice phenomenon to take a look at.\ According to the text, the Slocum Glider will possibly be used to ______.
微信支付 
支付宝支付